Thomas Edison

- Electric Light bulb -

About Thomas

Born February 11, 1847 . Thomas was called "dull" by his teachers , because of poor hearing and he had trouble in school and often didn't attend . His mom took him out of school and allowed him to set up a chemistry lab in the basement . When he was 12 he got a job working for the railroad , one day he saved the life of a child who had fallen onto the tracks of an oncoming train . The child's father taught him how to use a telegraph and that's when Edison invented a gadget that sent automatic telegraph signals . He Also invented the first practical Phonograph which records different things . Still in his 20's he decided to go into a "Invention Business . Before he died in 1931, Edison patented 1,093 of his inventions. The wonders of his mind include the microphone, telephone receiver, universal stock ticker, phonograph, kinetoscope (used to view moving pictures), storage battery, electric pen, and mimeograph.
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Edison With his family.

The Electric Lightbulb

It was his first high resistance , incandescent electric light . It worked by passing electricity through a thin- platinum filament in the glass vacuum bulb , which delayed the filament from melting , but it only burned for a few hours . Edison figured it needed some work so one day he decided to try carbonized cotton thread filament. When voltage was applied to the light bulb , it began to radiate a soft orange glow . Just about 15 hours later the filament finally burned out .
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The Significance of the light bulb

It eliminated peoples dependence on candles and oil lamps , it was easier to get around at night on streets and in houses . Also the light bulb wasn't dangerous it wouldn't cause a fire . They're aslo more convenient , as they don't blow out when its windy, they don't fizzle out when they get wet, and they don't run out of oil.
How a light bulb works
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